private void txtBoxCommand_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.Key is System.Windows.Input.Key.Enter)
{
string userInput = txtBoxCommand.Text;
if (FileReader.CommandIsValid(userInput))
{
txtBoxCommand.Clear();
lblMessage.Text = "";
controller.PerformCommand(userInput);
}
}
}